Key Pin Friction - was Heavy Playing S&S C

[Farrell]

Excellent! Thank you David. I have read all your articles several times.
Somehow missed lodging that into my memory bank cell(s). So much
information......so few brain cells left. I will do exactly that when my
inquisitive mind wants to know.

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com

----- Original Message -----
From: "David Stanwood" <dstanwood@hotmail.com>
To: <pianotech@ptg.org>
Sent: Monday, April 30, 2001 7:04 PM
Subject: Re: Key Pin Friction - was Heavy Playing S&S C


>
>
> Farrel writes:
>
> >And then how do techs evaluate key pin friction? I have never seen
anything
> >in print regarding any definitive procedures to evaluate key pin
friction.
>
> Terry,
>
> I published the method in the PTG Journal in my atricle:
>
> "Standard Protocols of the New Touchweight Metrology"
> PTG Journal February 2000
>
> Excerpt:
>
> "The new measurement called Key Friction Weight (KF) tells us precisely
how
> much of the Friction Weight is from the key bushings. Place the key on the
> front weight jig and follow the protocol for measuring negative Front
Weight
> (FW).  With the key on the jig, place temporary weights on top of the key
> and slide them back and forth until a position is found that makes the
Front
> Weight (FW) zero.  Then, without disturbing the position of the temporary
> weights, place the key back on the key frame and push the back of the key
> down onto the back rail cloth. Then find the minimum amount of weight
placed
> on the front of the key at the Measuring Point that causes the key to drop
> (Fig 8).  Another way is to place the key on the frame and attach a key
> leveling lead to hold the back of the key down. Then measure Up Weight and
> Down Weight (with stack off) and apply the formula (DownWt - UpWt)/2.  The
> value found is Key Friction Weight (KF)."
>
> Newton... taking three grams off the strike weight takes it down and out
of
> the concert weight (High) zone.... I would not recommend that although it
> will make the action feel better after taking out loads of lead....
>
> Tone is the primary concern... touch is secondary.  In nice pianos both
are
> nice....
>
> David Stanwood
>
>
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